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1955Epidemiologist Thomas Francis, Jr., MD (School of Public Health) announces on April 12 that the Salk polio vaccine is "safe, effective, and potent". He designed and conducted the largest clinical study ever undertaken using human subjects, involving 1.8 million children at 15,000 schools in 44 states and areas of Canada and Finland.

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We do nothing without your consent. is a free and secure tool that facilitates a partnership between health researchers and volunteers. Your membership lets us know that you may be interested in participating in clinical studies occurring at the University of Michigan, but you are never obligated; you are always free to say no, and can specify how often you would like to be contacted. You can deactivate your account at any time. Read Consent Document.